This could mean an entire family of drinks that include all cocktails made with lemon or lime juice. Specifically, when preceded by a type of spirit (e.g., whiskey sour, gin sour) it’s a formulation of spirit + lemon juice + simple syrup/sugar. In the long-gone era of the 1990s, and some lower-end bars today, it may also mean a drink that includes “sour mix,” a poor approximation of real lemon juice and sugar.
Sour
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